Re: arm64: pointer_auth.h:40:3: error: implicit declaration of function ‘get_random_bytes’; did you mean ‘get_random_once’?

From: Grygorii Strashko <grygorii.strashko@ti.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
	Naresh Kamboju <naresh.kamboju@linaro.org>,
	Mark Rutland <mark.rutland@arm.com>,
	"Theodore Ts'o" <tytso@mit.edu>,
	Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Mark Brown <broonie@kernel.org>,
	Richard Henderson <richard.henderson@linaro.org>,
	open list <linux-kernel@vger.kernel.org>,
	<lkft-triage@lists.linaro.org>, Emese Revfy <re.emese@gmail.com>,
	<hsinyi@chromium.org>, Will Deacon <will@kernel.org>,
	Willy Tarreau <w@1wt.eu>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: arm64: pointer_auth.h:40:3: error: implicit declaration of function ‘get_random_bytes’; did you mean ‘get_random_once’?
Date: Thu, 30 Jul 2020 22:43:39 +0300	[thread overview]
Message-ID: <f6cd5c6a-8779-e17d-2827-cbf531c969e2@ti.com> (raw)
In-Reply-To: <CAHk-=whX7gPBn+jthX8bbfz9kU+0CbYwTxbASwPRCZ1bhVqrOw@mail.gmail.com>



On 30/07/2020 22:40, Linus Torvalds wrote:
> On Thu, Jul 30, 2020 at 12:05 PM Grygorii Strashko
> <grygorii.strashko@ti.com> wrote:
>>
>> FYI. Below diff seems fixes build:
> 
> Thanks, I'll do that instead, it looks like the right thing to do regardless.
> 
> Mind sending me a sign-off for it (and commit message would be lovely
> too, but I can make something up)? Yeah, it's just a one-liner, but
> let's do this right.

I've also boot-tested it on Keystone 2 platforms.

Best regards,
grygorii

---
 From fa1238a8e4b7c603fcc0fb5f6169c212035aef4f Mon Sep 17 00:00:00 2001
From: Grygorii Strashko <grygorii.strashko@ti.com>
Date: Thu, 30 Jul 2020 22:05:01 +0300
Subject: [PATCH] ARM: percpu.h: fix build error
MIME-Version: 1.0
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Fix build error for the case:
  defined(CONFIG_SMP) && !defined(CONFIG_CPU_V6)

config: keystone_defconfig

CC      arch/arm/kernel/signal.o
In file included from ../include/linux/random.h:14,
                  from ../arch/arm/kernel/signal.c:8:
../arch/arm/include/asm/percpu.h: In function ‘__my_cpu_offset’:
../arch/arm/include/asm/percpu.h:29:34: error: ‘current_stack_pointer’ undeclared (first use in this function); did you mean ‘user_stack_pointer’?
    : "Q" (*(const unsigned long *)current_stack_pointer));
                                   ^~~~~~~~~~~~~~~~~~~~~
                                   user_stack_pointer

Fixes: f227e3ec3b5c ("random32: update the net random state on interrupt and activity")
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
  arch/arm/include/asm/percpu.h | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/arch/arm/include/asm/percpu.h b/arch/arm/include/asm/percpu.h
index f44f448537f2..1a3eedbac4a2 100644
--- a/arch/arm/include/asm/percpu.h
+++ b/arch/arm/include/asm/percpu.h
@@ -5,6 +5,8 @@
  #ifndef _ASM_ARM_PERCPU_H_
  #define _ASM_ARM_PERCPU_H_
  
+#include <asm/thread_info.h>
+
  /*
   * Same as asm-generic/percpu.h, except that we store the per cpu offset
   * in the TPIDRPRW. TPIDRPRW only exists on V6K and V7
-- 
2.17.1

